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SUMMARY:The electroweak chiral Lagrangian with a light Higgs - systematics
  & application
DTSTART;VALUE=DATE-TIME:20160519T100000Z
DTEND;VALUE=DATE-TIME:20160519T110000Z
DTSTAMP;VALUE=DATE-TIME:20260619T010339Z
UID:indico-event-2744@indico.ific.uv.es
DESCRIPTION:I consider the Standard Model as an effective field theory (EF
 T) at the electroweak scale v. At the scale f >= v I assume a new\, strong
  interaction that breaks the electroweak symmetry dynamically. The Higgs b
 oson arises as a composite pseudo-Nambu-Goldstone boson in these scenarios
  and is therefore naturally light (m_h ~ v). Based on these assumptions an
 d the value of \\xi= v^2 / f^2\, I explain the systematics that governs th
 e effective expansion: For \\xi = O(1) the effective theory is given by a 
 loop expansion\, equivalent to an expansion in chiral dimensions (similar 
 to chiral perturbation theory). I will briefly discuss the operators that 
 arise at next-to-leading order [O(f^2 / \\Lambda^2) ~ O(1/16\\pi^2)]. On t
 he other hand\, in the decoupling limit where \\xi -> 0\, an expansion in 
 canonical dimension is recovered. The case where \\xi is small but non-zer
 o is of phenomenological interest. It leads to a double expansion in \\xi 
 and 1/16\\pi^2\, which captures the expected corrections of a strongly-int
 eracting light Higgs to the Standard Model in a systematic way. Further\, 
 I will apply the leading order chiral Lagrangian to current LHC Higgs data
 . I will show that this gives a QFT justification of the kappa-framework\,
  which is currently used as phenomenological signal-strength parametrizati
 on by the experiments at the LHC. I will also present a fit of the leading
  order chiral Lagrangian to the LHC Higgs data.\n\nhttps://indico.ific.uv.
 es/event/2744/
LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario
URL:https://indico.ific.uv.es/event/2744/
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